Bearing puller



April 23, 1957 R. E. MILLSAP BEARING FULLER original Filed Nov. 1, 1952ATToR/VEY.

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Z d@ ///Y P BEARING PULLER Robert E. Millsap, Omaha, Nebr.

Application March 22, 1956, Serial No. 573,231

4 Claims. (Cl. 29-259) This invention relates to bearing pullers andmore particularly it is an object to provide a bearing puller ofimproved construction.

Bearing pullers of the prior art have been constructed in a mannerpermitting the pulling bolt to directly engage the end of the shaft. Theends of such pulling bolts are pointed as a rule but nevertheless theconstant turning of the end of the pulling bolt in the centering hole inthe end of a shaft damages the shaft severely, making it impossible toturn the shaft later in a lathe without rst re-centering the shaft.

The prior art bearing pullers have had a back crossbar but have lacked afront crossbar, not having anything to gain in having a front crossbarbecause of using the bolt itself to engage the shaft.

So one object of the invention is to employ a front crossbar secured toan engaging head to eliminate prior art disadvantages, the pulling boltrotating in the head rather than in the shaft.

A particular object is to have the pulling bolt rotate with respect to apoint shaft engaging member, rather than rotating with respect to theshaft itself.

Still another object is to provide holes through the for- Ward crossbarfor receiving pins to hold the clamping arms onto a bearing or wheel tobe pulled, as Well as gears, couplings and the like.

Yet another new object is an extension which is used when bearings areclose to the end of the shaft.

Still another object is to provide a bearing ball in h head member toreceive the rotary thrust of the pulling Yet another object of theinvention is to provide a device for the purpose described which issturdy and durable in construction, reliable and efficient in operation,and relatively simple and inexpensive to manufacture, assemble andutilize.

This application is a continuation of the applicants cpending patentapplication No. 318,181, tiled November l, 1952, now abandoned.

Other and further objects and advantages of the present invention willbe apparent from the following detailed description, drawings andclaims, the scope of the invention not being limited to the drawingsthemselves as the drawings are only for the purpose of illustrating away in which the principles of this invention can be applied.

Other embodiments of the invention utilizing the same or equivalentprinciples may be used and structural changes may be made as desired bythose skilled in the art without departing from the present inventionand the purview of the appended claims In the drawings:

Figure 1 is a top plan view of the device, showing it exerting a forceagainst the center of a shaft and exerting an outward pull against thebackside of a bearing or gear;

Figure 2 is an end elevation showing the device as it would be seen fromthe right hand side in Figure l; and

Figure 3 shows an extension member in use with the device, an upperportion of the puller not being shown.

Patented Apr. 23, 1957 fice Referring in detail to the drawings, thenumeral 1 indicates parallel slotted pulling bars, terminating ininturned portions 2 for forming hooks to engage a bearing 3.

The rearward horizontal crossbar 4 and the forward horizontal crossbar 5pass through slots 6 in the pulling bars 1 so that the pulling bars maymove in a horizontal plane. A Cotter pin 7 is placed in holes S in thelower horizontal crossbar 5 to prevent motion in the horizontal planeafter pulling bars 1 are adjusted to the external diameter of thebearing 3.

Extending through the internally threaded bore 9 of the boss 8 of therearward crossbar 4 is a threaded pulling bolt 10 having a head 11 atits rearward end and a hemispherical concave surface 12 at its forwardend, which contacts the surface of a ball bearing 13.

The bottom seat of the ball bearing 13 is a socket 14 in a head member15, which is firmly attached to the crossbar 5 and has a hard conicalend 16, which is adapted to seat in the centering hole 16 of a bearingshaft 17.

Figure 3 indicates the necessarily different method of using thisbearing puller when the bearing is close to the end of the shaft,through use of an extension bar 18.

The extension bar 18 has a recess 19 to receive the pointed end 16 ofthe head 15 at its upper end; a cylindrical portion 19 and a conicalpointed end 26, which latter seats in the center of the bearing shaft17.

The shaft 17 and bearing 3 are included in the drawing only to indicatethe function of the invention, and are not parts of the invention.

In operation, the hook portions 2 are placed on the inner side of thebearing 3. Then the cotter pins 7 are placed in those holes 8 in thecrossbar 5 that are closest to the outside surfaces 21 of the pullingbars 1. This prevents motion of pulling bars 1 in a lateral directionalong crossbars 5 and 5.

The hexagonal head 11 of the screw 10 is rotated with a wrench until thepoint 16 is brought in contact with the center of the shaft 17.

The hexagonal head 11 is then further rotated, creating an inward forcethrough the point 15 onto the shaft 17 and an outward force istransmitted through the threaded bore 9 of the boss 8 to the crossbar 4.

The crossbar 4 then transmits this outward force against the surface 22of the puller bars 1, causing hook portions 2 of the puller bar 1 toexert an outward force 0n the bearing 3. Thus a double action isachieved, namely, a downward thrust is transmitted to the shaft and anupward lift given to the bearing simultaneously.

This device does not injure the shaft 17 as the rotary action of thepulling bolt 10 is absorbed not by the shaft 17 but by the ball 13.

From the foregoing description, it is thought to be obvious that abearing puller constructed in accordance with my invention isparticularly Well adapted for use, by reason of the convenience andfacility with which it may be assembled and operated, and it will alsobe obvious that my invention is susceptible of some change andmodication without departing from the principles and spirit thereof, andfor this reason I do not wish to be understood as limiting myself to theprecise arrangement and formation of the several parts herein shown incarrying out my invention in practice, except as claimed.

I claim:

1. A bearing puller comprising a pulling bolt having one end adapted tobe rotated, the shank of said pulling bolt being threaded, the forwardend of said bolt having a cylindrical portion having a smooth surface,the for-l ward end of said cylindrical portion having a concave recesstherein; a one-piece integral head member having a recess in itsrearward end rotatably receiving said cylindrical portion of saidpulling bolt, said head recess havingy a conc-ave inner wall, said' headportion having a conically shaped pointed forward end; `said conicalforward end having a rearward end portion of diameter substantially asgreat as the thickness of said head member for engaging the outer edges`of centering holes in bearing shafts when such centering holes vary indiameter to a substantial degree; a forward cross bar attached to saidhead member, said forward cross bar having two portions ex-tendingoutwardly on each side of said head member transversely thereof, saidforward cross bar portions `each having apertures extending downwardlytherethrough, said aperture-s being spaced apart various distances `fromthe inner ends -respectively of each of said half cross bar portions; abearing ball disposed between the forward end of said cylindricalportion of said pulling bolt and the inner end of said head memberrecess; a boss member having an internally threaded bore receiving saidpulling bolt, said boss being disposed inwardly from the forward end ofsaid pulling bolt; a rear cross bar having two half portions eachattached to said boss at their inner ends and disposed extendingoutwardly from said head member transversely to said pulling bolt and onopposite sides of said boss; tw-o pulling bars disposed one on each sideof said pulling bolt, each pulling bar having an elongated main portiondisposed in parallelism with said pulling bolt in use; said mainportions each having an elongated longitudinal slot therein disposed inparallel-ism with said pulling bolt, each slot slid-ably receivingtherethrough respectively one half portion of said forward and rearwardcross bars, the forward ends of said pulling bars each having anend-turned hook portion for engaging an inner side of a bearing at atime when the pointed end of said head is disposed engaging acylindrical hole in a shaft carrying said bearing whereby when saidpulling bolt is rotated rearward the rearward crossbar will engage therearward ends of the walls of said pulling bar slots; two securingmembers disposed one `on the outer side of each of said pulling bars anddisposed in each one of said apertures in said forward cross bar forengaging the outer side of `said pulling bars to maintain them in aselected position during operation.

2. A bearing puller comprising a pulling bolt having one end adapted t-obe rotated, the shank of said pulling bolt being threaded, the forwardend of said bolt having a cylindrical portion having a smooth surface,the forward end of said cylindrical portion having a concave recesstherein; a one-piece integral head member having a recess in itsrearward end rotatably receiving said cylindrical portion of saidpulling bolt, said head recess having a concave inner wall, said headportion having a conically shaped pointed forward end; said conicalforward end having a rearward end portion of diameter substantially asgreat as the thickness Iof said head member for engaging the outer edgesof centering holes in bearing shafts when such centering holes vary indiameter to a substantial degree; a forward cross ybar attached to `saidhead member, said forward cross bar having 'two portions extending`outwardly on each side of said head member transversely thereof, abearing ball disposed between the forward end of said cylindricalportion of said pulling bolt and the inner end of said head memberrecess; a boss member having an internally Ithread-ed bore receivingsaid pulling bolt, said boss being disposed inwardly from the forwardend of said pulling bolt; a rear cross bar having two half portions eachattached to said boss at their inner ends and disposed extendingoutwardly from said head member transversely to said pulling bolt and onopposite `sides of said boss; two pulling bars disposed one on each sideof said pulling bolt, each pulling bar having `an elongated main portiondisposed in parallelism with said pulling boit in use; said mainportions each having an elongated vlongitudinal slot therein disposed inparallelism with said pulling bolt, each slot 'slidably receivingtherethrough respectively one-half portion of s'a-id forward andrearward cross bars, the forward ends of said pulling bars each havingan end-turned hook portion for engaging an inner side of a bearing at atime when `the pointed end of said head is disposed engaging acylindrical hole in a `shaft carrying said bearing whereby when Saidpulling bolt is rotated rearward the rearward crossbar will engage therearward ends of the walls of said pulling bar slots; and securing means`attachable to said forward cross bar portions respectively Iandengaging the outer Isides of said pulling bars to prevent said pullingbars from `slipping o of the sides of said forward crossbar.

3. A bearing puller comprising a pulling bolt having one end adapted tobe rotated, the shank of said pulling bolt being threaded, `the forwardend of said bolt having a cylindrical portion having a smooth surface,the forward end of said ycylindrical portion having a concave recesstherein; a head member having a recess in its rearward end rotatablyreceiving said cylindrical portion of said pulling bolt, said headrecess having a concave inner wall, said head portion having a conicallyshaped pointed forward end; a forward cross bar attached to said headmember, said forward cross bar having two portions extending outwardlyou each side of said head member transversely thereof, a bearing balldisposed -between the forward end of said cylindrical portion of saidpulling bolt and the inner end of said head member recess; a boss memberhaving an internally threaded bore receiving said pulling bolt, saidboss being disposed inwardly from the forward end of said pulling bolt;a rear cross bar having two half portions each attached to said boss attheir inner ends and ldisposed extending outwardly from said head membertransversely to said pulling bolt and on opposite sides of said boss;two pulling bars disposed one on each side of said pulling bolt, eachpuliing bar having an elongated main portion disposed in parallelismwith said pulling bolt in use; said main portion each having anelongated longitudinal slot therein disposed in parallelism with saidpulling bolt, each slot slidably receiving therethrough respectively onehalf portion of said forward and rearward cross bars, the forward endsof said pulling bars having an end-turned hook portion for engaging aninner side of a bearing at a time when the pointed end of said head isdisposed engaging a cylindrical hole in a shaft carrying said bearingwhereby when said pulling bolt is rota-ted rearward the rearward crossbar will engage the rearward ends of the walls of said pulling barslots; and securing means yattachable to said forward cross barportion-s respectively and engaging the outer sides of said pulling barsto prevent said pulling bars from slipping off of the sides of saidforward cross bar.

4. A bearing puller comprising a pulling bolt having one end adapted tobe rotated, the shank of said pulling bolt being threaded, the forwardend cf said bolt having a cylindrical portion having a smooth surface, ahead member disposed forwardly of said pulling bolt, said head memberhaving conical mea-ns on its forward end for engaging centering hole,means rotatably attaching the forward end of saidV pulling bolt to therearward end of said head member; a forward cross bar attached to saidhead member, said forward cross bar having two portions exten-dingoutwardly on each side of said head member transversely thereof, abearing ball disposed ybetween the forward end of said cylindricalportion of said pulling bolt andthe inner end of said head memberrecess; a boss member rhaving an internally threaded bore receiving saidpulling bolt, said boss being disposed inwardly from the forward end ofsaid pulling bolt; a rear cross bar having two half portions eachattached to said boss at their inner ends and disposed extendingoutwardly from said head member transversely to said pulling bolt and onopposite sides -of said boss; two pulling `bars disposed one on eachside of said pulling bolt, each pulling bar having an elongated mainportion disposed in parallelism with said pulling bolt in use; said mainportions `each having an elongated longitudinal slot therein disposed 1nparallelism with said pulling bolt, each slot slidably receivingtherethrough respectively one half portion of said forward rand rearwardcross bars, the forward `ends `of said pulling bars each having anend-turned hook portion for engaging an inner side of a bearing at atime when the pointed end of said head is disposed engaging acylindrical hole in a shaft carrying said bearing whereby when saidpulling bolt is rotated rearward the rearward cross bar will engage therearward ends of the walls `of said pulling bar slots; and securingmeans attaehable to said forward cross bar portions Irespectively andengaging the outer sides of said pulling 4bars to prevent said pullingbars from slipping olf of the sides of said forward `cross bar.

References Cited inthe le of this patent UNITED STATES PATENTS HollandJune 29, 1920 Sterling et al Mar. 4, 1924 Eisenhuth May 18, 1926 KingJune 26, 1934 McGinnis et al Oct. 17, 1944 Hoke Sept. 18, 1945 Pihl May8, 1951 FOREIGN PATENTS Australia Nov. 5, 1945

